Metal-shaping die.



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' wrrNEssEs fh-MW No. 648,703. Patented May I, |900.

A J. G. MGDUWELL.v

METAL SHAPING DIE.

I (Application med Aug. 24, 1599.)

(No Model.) 2 Sheets-Sheet 2.

WITNESSES INVEN'VI'GR` fw; @www Mx/@w 0M mi Nonms PETER'S co,vHcrrmLn'Mo.4 wAsHlNm'uN, n, c.

UNrTE-Da STATES PATENT' Frison.

JOHN G. IWICDOWELL, OF PITTSBURG, PENNSYLVANIA.

METAL-SHAPING DIE.

SPECIFICATION forming part of Letters Patent No. 648,703, dated May 1,1900.

Application filed August 24, 1899.y Serial No. 728,310. (N mtlel To @ZZwhom, it ntcty concern:

Be it known that I, JOHN Gr. MCDOWELL, of Pittsburg, in the county ofAllegheny and State of Pennsylvania, have invented a new and usefulImprovement in Metal-Shaping Dies, of which the following is a full,clear, and exact description, reference being had to the accompanyingdrawings, forming part of this specification, in which- 1o Figure 1 is aside elevation of a pair of dies constructed in accordance with myinvention. Fig. 2 is a central vertical cross-section of the same; andFig. 3 is a plan view, partly broken away, of the lower die.

My invention relates to the punching or shaping of sheet metal, and moreparticularly to the forming of sheet-metal articles from whichprojections are struck up in opposite directions; and its object is toprovide a simzo ple and effective die system which at a single strokewill punch or strike up both upward and downward projections from thesheetmetal blank acted upon.

In the drawings, in which I show my invenz 5 tion as applied to themaking of wall-ties such as shown in my Patent No.620,34c9, datedFebruary 28, 1899, A is an upper reciprocating die, and B a lowerstationary die. As

these dies are the same in construction, I will 3o describe thestationary one, similar numerals being applied to corresponding parts ofthe other.

In the lower die B, 2 is a base-block, provided on each side of itscenter with a longi- 3 5 tudinal series of cylindrical holes 3,containing punches 4, secured by means of set-screws 5, by which theirposition may be regulated. This base-block is secured to a backing-plate6, having a central recess 7, containinga spiral spring 8, acting upon aplunger 9. This plunger is provided with a central rectangular lug orpost 10, which projects upwardly through a similarly-shaped slot in thebase-block, and to the post is secured a die-block 11, having a seriesof round holes therethrough, part of which register with the holes inthe baseblock, this block 11 being held by a screwholt 12. A clampingand shearing plate or projection 13 is secured centrally to the block 5o11, preferably by dovetailing, as shown in Fig. 2, and this plate isprovided with angular notches 14, which register with the round holes inthe shearing-block. To prevent longitudinal movement of the plate 13, Iprovide pins 15, which'enter notches in such plate 55 and are secured bykeys 16. The block 11 is provided with guiding-holes 17 to receive pins1S upon the block 11 of the other die, so as to keep the dies in properalinement during the stroke. The punches of the upper recip- 6o rocatorydie are arranged alternately with those of the lower die, so that theywill enter those holes of the lower die' which alternate with the holesentered by the lower die punches. To prevent scale or dirt, which maylodge on the upper-die block or lower base-block,from changing theextent of movement of the die-block, I form teats or projections 19 uponthe lower vbase-block and the rear of the upper-die block. Any scaledrop- 7o ping on these parts will lodge between the projections and notinterfere with the proper movements.

The operation is as follows: Ablank or strip of sheet metal being laidin proper position upon the lower plate 13, the upper die is moveddownwardly. The upper plate 13 first contacts with the blank and clampsit between these two plates. As the motion continues the plungers arepressed backwardly 8o into their cylinders and the punches of the upperdie coact with the notched portions of the lower shearing-plate to cutand bend downward projections, while the punches of the lower die have acorresponding action cooperating with the registering notches of theupper plate to form upward projections. These plates 13 are of temperedsteel, and their notched portions coact with the angular portions andthe punches to shear and bend 9o the edge portions of the blank. As theupper die again rises the plates 13 move forward over they punches andact to strip the blank therefrom, which willrest by gravity on the lowerplate and may be removed and another inserted.

The advantages of my invention result from the formation ofoppositely-extending proj ections or struck-up portions at asinglestroke of the press and by means of a simple conroc struction of dieswhich are not liable to get out of order.

Many variations may be made in the form j and arrangement of thepunches, as well as in the other parts, Without departing from myinvention.

I claiml. In shaping-presses, a pair of dies, each havingshaping-punches and a movable plate having holes to receive the punches,each of said plates also having holes or recesses to re- Ceive thepunches of the other die; substantially as described.

2. A pair of dies, each having punches, and each having a movable memberarranged to receive the punches of both sets of dies; substantially asdescribed.

3. A die having punches,a spring-supported plate having holes receivingthe punches, and a cooperating die having punches, the springpressedplate having holes to receive the punches of the opposite die;substantially as described.

4. A pair o f dies, each having punches and each having a movable membercontaining holes or recesses for receiving both sets of punches, saidmembers having projections arranged to clamp the blank; substantially asdescribed.

5. A pair of dies having projecting punches, spring-supported plateshaving holes for the punches, and projecting clamping-plates secured tothe movable plates and having shearing edge portions to coact with thepunches of the opposite die; substantially as described. v 6. A pair ofshaping-dies, each having a movable plate or member and projecting lugsarranged to limit the movement of the movable plates; substantially asdescribed.

In testimony whereof I have hereunto set my hand. l

JOI-IN G. MCDOWELL.

Vitnesses:

M. S. MURPHY, G. B. B/LEMMING.

